Geräte Informationen:

The Model 5220A is a transconductance amplifier designed to
operate as either a stand alone unit or an extension of the
Fluke Model 5100 Series Calibrator. Functionally, the
instrument operates as a precision ac/dc current source for
calibrating current shunts and/or current meters. As the
name (transconductance amplifier) implies, the output
current level is a function of an input control voltage. The
input/output ratio is established at 1:1 so that a voltage
input in the range of -20 to +20 volts will produce a
proportional current output of -20 to +20 amperes. Input
voltages may be either dc or ac levels, depending on the
output requirements. Bandwidth for ac operation is dc to 5 kHz.
Control of the 5220A can be handled locally using front
panel controls or remotely by way of the 5100 Series
Calibrator. (The 5100 must be equipped with a Model Y5000
Interface.) Control mode selection is accomplished using two
front-panel push button switches, INPUT and LOCAL. The INPUT
switch allows selection of either front or rear
control-voltage input connections. The LOCAL switch is used
to recall the 5220A from remote to local operation.
A series of front panel indicators are used to visually
display both the control and operating status of the 5220A.
Control indicators include OPER (operate), STDBY (standby),
FRONT input, REAR input, REMOTE, and LOCAL LOCKOUT. The
combination of lit LEDs indicates the present status of the
control mode. Status indicators include THERMAL CUT-OFF,
OVER COMPLIANCE, and OVER CURRENT. When any one of these
indicators is lit, an overload condition has been detected
causing the 5220A to switch to standby operation. All
indicators are active regardless of the selected control
mode, local or remote.
Current output connections are provided on both the front
and rear panels. However, only one set of terminals is
active. Selection of the desired set is accomplished
internally and is, therefore, not considered an operator
function. Neither local nor remote operation is affected by
the selection of front or rear output.
Forced-air circulation is incorporated in the 5220A to
ensure adequate cooling of the current output stage. Air is
pulled in through a rear-panel filter, passed over the
output stage heat sink, and exhausted through the unit's
side panels.
The 5220A is designed to operate from ac line voltages
within the range of 90 V ac to 264 V ac, 50 to 60 Hz.
One-of-eight specific voltages (100, 110, 115, 120, 200,
220, 230, 240 V ac +10 %) can be selected to ensure
compatibility with the local line voltage. The
selection switches are inside the 5220A. Refer to Section 4
of this manual for information on how to properly set the
line power switches.
Accessories available for use with the 5220A are listed and
described in Table 1-1. The rack mounting kits are designed
for use with a standard 19-inch equipment rack. The Model
Y5020A is a precision current shunt recommended for use in
calibrating the 5220A. Specify both model number and
description when ordering accessories.